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Operations and Summary of Significant Accounting Policies - Stock Based Compensation (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-based compensation activity, including both continuing and discontinued operations
Stock-based compensation expense recognized in operating expenses	$ 12,299us-gaap_AllocatedShareBasedCompensationExpense	$ 12,053us-gaap_AllocatedShareBasedCompensationExpense	$ 10,205us-gaap_AllocatedShareBasedCompensationExpense
Tax benefit of stock-based compensation expense in provision for income taxes	4,384us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4,225us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3,610us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Stock-based compensation expense, net of tax	7,915us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	7,828us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	6,595us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Fair value of shares vested	12,354us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	12,090us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	10,195us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Proceeds to the Company from the exercise of stock-based compensation	4,582us-gaap_ProceedsFromStockOptionsExercised	15,057us-gaap_ProceedsFromStockOptionsExercised	4,925us-gaap_ProceedsFromStockOptionsExercised
Tax benefit from exercise of stock-based compensation, including shortfall tax benefits	(268)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	(2,645)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	(233)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Stock-based compensation cost capitalized in inventory	$ 559us-gaap_OtherInventoryCapitalizedCosts	$ 463us-gaap_OtherInventoryCapitalizedCosts	$ 417us-gaap_OtherInventoryCapitalizedCosts
1994 Plan
Stock-Based Compensation
Requisite service period for options to vest	4 years
Expiration period for options granted	7 years
Age after which vesting of options granted accelerates if the grantee ceases to be employed by the entity	60 years
2011 Plan
Stock-Based Compensation
Maximum common stock shares that may be issued under plan	16.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = ssd_StockOptionAndRestrictedStockUnitPlan2011Member

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Represents the age after which vesting of options granted will be accelerated if the grantee ceases to be employed by the entity.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Gross amount of an expenditure that is incurred which is not expensed in the current period but rather capitalized as a component of inventory.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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